Clark County, Illinois
Clark County is a county in the southeastern part of U.S. state of Illinois, along the Indiana state line. As of the 2020 census, the population was 15,455.[1] The county seat is Marshall.[2] The county was founded in 1819 and named for George Rogers Clark, an officer who served in the American Revolutionary War.[3]
Clark County, Illinois Media
- USA Clark County, Illinois age pyramid.svg
2000 census age pyramid for Clark County
- Clark County Illinois 1819.png
Clark County from the time of its creation to 1821
- Clark County Illinois 1821.png
Clark between 1821 and 1823
- Clark County Illinois 1823.png
Clark between 1823 and 1830
- Clark County Illinois 1830.png
Clark reduced to its current size in 1830 by the creation of Coles County